text: /****************************************************************************
   * arch/sim/src/sim/up_x11eventloop.c
   *
   *   Copyright (C) 2011 Gregory Nutt. All rights reserved.
   *   Author: Gregory Nutt <gnutt@nuttx.org>
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   * 3. Neither the name NuttX nor the names of its contributors may be
   *    used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
   * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
   * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
   * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
   * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
   * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
   * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   * POSSIBILITY OF SUCH DAMAGE.
   *
   ****************************************************************************/
  
  /****************************************************************************
   * Included Files
   ****************************************************************************/
  
  #include <stdio.h>
  
  #include <X11/Xlib.h>
  
  /****************************************************************************
   * Public Function Prototypes
   ****************************************************************************/
  
  extern void up_buttonevent(int x, int y, int buttons);
  
  /****************************************************************************
   * Public Data
   ****************************************************************************/
  
  /* Defined in up_x11framebuffer.c */
  
  extern Display *g_display;
  
  /****************************************************************************
   * Private Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Name: up_buttonmap
   ****************************************************************************/
  
  static int up_buttonmap(int state)
  {
    int buttons = 0;
  
    /* Remove any X11 dependencies.  Just maps ButtonNMask to bit N. */
  
    if ((state & Button1Mask) != 0)
      {
        buttons |= 1;
      }
  
    if ((state & Button2Mask) != 0)
      {
        buttons |= 2;
      }
  
    if ((state & Button3Mask) != 0)
      {
        buttons |= 4;
      }
  
    return buttons;
  }
  
  /****************************************************************************
   * Public Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Name: up_x11events
   *
   * Description:
   *   Called periodically from the IDLE loop to check for queued X11 events.
   *
   ****************************************************************************/
  
  void up_x11events(void)
  {
    XEvent event;
  
    /* Check if there are any pending, queue X11 events. */
  
    if (g_display && XPending(g_display) > 0)
      {
        /* Yes, get the event (this should not block since we know there are
         * pending events)
         */
  
        XNextEvent(g_display, &event);
  
        /* Then process the event */
  
        switch (event.type)
          {
            case MotionNotify : /* Enabled by ButtonMotionMask */
              {
                up_buttonevent(event.xmotion.x, event.xmotion.y,
                               up_buttonmap(event.xmotion.state));
              }
              break;
  
            case ButtonPress  : /* Enabled by ButtonPressMask */
            case ButtonRelease : /* Enabled by ButtonReleaseMask */
              {
                up_buttonevent(event.xbutton.x, event.xbutton.y,
                               up_buttonmap(event.xbutton.state));
              }
              break;
  
            default :
              break;
          }
      }
  }
  